I have been asked by my friend to help him as he wants to bulk up. He's 5'7 or 8 and 133 pounds or so.

Hell, I don't even know what his diet is. He's pretty skinny and I would guess doesn't eat too much all in all unless it's a saturday night.

There is no such thing as a hardgainer....just someone not eating enough. He only needs to lift a couple times a week...but he HAS to focus on eating more...otherwise he won't gain anything no matter how often he works out. The Zone shouldn't even be a concern....it should be a free forall with protein/fat on non-workout days....and protein/carbs on workout days.